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{-# LANGUAGE MagicHash , UnboxedTuples #-}
module T8598(fun) where
import GHC.Float (Double(..))
import GHC.Integer (decodeDoubleInteger, encodeDoubleInteger)
-- Float.scaleFloat for Doubles, slightly simplified
fun :: Double -> Double
fun x | isFix = x
| otherwise = case x of
(D# x#) -> case decodeDoubleInteger x# of
(# i, j #) -> D# (encodeDoubleInteger i j)
where
isFix = isDoubleFinite x == 0
foreign import ccall unsafe "isDoubleFinite" isDoubleFinite :: Double -> Int
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